bge

- SUNW,bge Gigabit Ethernet driver for Broadcom BCM57xx

Synopsis

/dev/bge*

Description

The bge Gigabit Ethernet driver is a multi-threaded, loadable, clonable, GLD-based STREAMS
driver supporting the Data Link Provider Interface, dlpi(7P), on Broadcom BCM57xx (BCM5700/5701/5703/5704/5705/5705M/5714/5721/5751/5751M/5782/5788
on x86) Gigabit Ethernet controllers fitted to the system motherboard. With the
exception of BCM5700/BCM5701/BCM5704S, these devices incorporate both MAC and PHY functions and
provide three-speed (copper) Ethernet operation on the RJ-45 connectors. (BCM5700/BCM5701/BCM5704S do not have
a PHY integrated into the MAC chipset.)

The bge driver functions include controller initialization, frame transmit and receive, promiscuous
and multicast support, and error recovery and reporting.

The bge driver and hardware support auto-negotiation, a protocol specified by the
1000 Base-T standard. Auto-negotiation allows each device to advertise its capabilities and
discover those of its peer (link partner). The highest common denominator supported
by both link partners is automatically selected, yielding the greatest available throughput, while
requiring no manual configuration. The bge driver also allows you to configure
the advertised capabilities to less than the maximum (where the full speed
of the interface is not required), or to force a specific mode of
operation, irrespective of the link partner's advertised capabilities.

APPLICATION PROGRAMMING INTERFACE

The cloning character-special device, /dev/bge, is used to access all BCM57xx devices
( (BCM5700/5701/5703/5704, 5705/5714/5721/5751/5751M/5782 on x86) fitted to the system motherboard.

The bge driver is managed by the dladm(1M) command line utility, which
allows VLANs to be defined on top of bge instances and
for bge instances to be aggregated. See dladm(1M) for more details.

You must send an explicit DL_ATTACH_REQ message to associate the opened stream
with a particular device (PPA). The PPA ID is interpreted as an
unsigned integer data type and indicates the corresponding device instance (unit) number.
The driver returns an error (DL_ERROR_ACK) if the PPA field value does not
correspond to a valid device instance number for the system. The device
is initialized on first attach and de-initialized (stopped) at last detach.

The values returned by the driver in the DL_INFO_ACK primitive in response
to a DL_INFO_REQ are:

Maximum SDU is 1500 (ETHERMTU - defined in <sys/ethernet.h>).

Minimum SDU is 0.

DLSAP address length is 8.

MAC type is DL_ETHER.

SAP length value is -2, meaning the physical address component is followed immediately by a 2-byte SAP component within the DLSAP address.

Once in the DL_ATTACHED state, you must send a DL_BIND_REQ to associate
a particular Service Access Point (SAP) with the stream.

CONFIGURATION

By default, the bge driver performs auto-negotiation to select the link speed
and mode. Link speed and mode can be any one of the
following, (as described in the IEEE803.2 standard):

1000 Mbps, full-duplex

1000 Mbps, half-duplex

100 Mbps, full-duplex

100 Mbps, half-duplex

10 Mbps, full-duplex

10 Mbps, half-duplex

The auto-negotiation protocol automatically selects:

Speed (1000 Mbps, 100 Mbps, or 10 Mbps)

Operation mode (full-duplex or half-duplex)

as the highest common denominator supported by both link partners. Because the
bge device supports all modes, the effect is to select the highest
throughput mode supported by the other device.

Alternatively, you can set the capabilities advertised by the bge device using
ndd(1M). The driver supports a number of parameters whose names begin with adv_
(see below). Each of these parameters contains a boolean value that determines
whether the device advertises that mode of operation. The adv_pause_cap indicates whether
half/full duplex pause is advertised to link partner. And the adv_asym_pause_cap can
be set to advertise to link partner that asymmetric pause is desired.
In addition, bge uses adv_100T4_cap to advertise its 100T4 capability. The adv_autoneg_cap
parameter controls whether autonegotiation is performed. If adv_autoneg_cap is set to 0, the
driver forces the mode of operation selected by the first non-zero parameter
in priority order as listed below:

All capabilities default to enabled. Note that changing any capability parameter causes
the link to go down while the link partners renegotiate the link
speed/duplex using the newly changed capabilities.

The current settings of the parameters may be found using ndd-get.
In addition, the driver exports the current state, speed, duplex setting, and
working mode of the link via ndd parameters (these are read only
and may not be changed). For example, to check link state of device
bge0:

The output above indicates that the link is up and running at
100Mbps full-duplex with its rx/tx direction pause capability. In addition, the driver
exports its working mode by loop_mode. If it is set to 0,
the loopback mode is disabled.

The default MTU is 1500. To enable Jumbo Frames support, you can
configure the bgedriver by defining the default_mtu property in driver.conf(4) to greater
than 1500 bytes (for example: default_mtu=9000). Note that the largest jumbo size
supported by bge is 9000 bytes. Additionally, not all bge–derived devices currently
support Jumbo Frames. The following devices support Jumbo Frames up to 9KB:
BCM5700, 5701, 5702, 5703C, 5703S, 5704C, 5704S, 5714C, 5714S, 5715C and
5715S. Other devices currently do not support Jumbo Frames.